<!DOCTYPE html><html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>401</title>
    <style>
      * {
        margin: 0;
        padding: 0;
      }
      body {
        background: black;
      }
      canvas {
        display: block;
      }
    </style>
  </head>
  <body>
    <canvas id="ad"></canvas>
    <script>
      var ad = document.getElementById("ad");
      var ctx = ad.getContext("2d");
      ad.height = window.innerHeight;
      ad.width = window.innerWidth;
      var chinese = "401";
      chinese = chinese.split("");
      var font_size = 10;
      var columns = ad.width / font_size;
      var drops = [];
      for (var x = 0; x < columns; x++) drops[x] = 1;
      function draw() {
        ctx.fillStyle = "rgba(0, 0, 0, 0.05)";
        ctx.fillRect(0, 0, ad.width, ad.height);
        ctx.fillStyle = "#0F0";
        ctx.font = font_size + "px arial";
        for (var i = 0; i < drops.length; i++) {
          var text = chinese[Math.floor(Math.random() * chinese.length)];
          ctx.fillText(text, i * font_size, drops[i] * font_size);
          if (drops[i] * font_size > ad.height && Math.random() > 0.975)
            drops[i] = 0;
          drops[i]++;
        }
      }
      setInterval(draw, 50);
    </script>
  </body>
</html>